include/linux/kdev_t.h: remove new_valid_dev()

As all new_valid_dev() checks have been removed it's time to drop
new_valid_dev() itself.

No functional change.

Signed-off-by: Yaowei Bai <baiyaowei@cmss.chinamobile.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

include/linux/kdev_t.h

@@ -35,11 +35,6 @@ static inline dev_t old_decode_dev(u16 val)
 	return MKDEV((val >> 8) & 255, val & 255);
 }
 
-static inline bool new_valid_dev(dev_t dev)
-{
-	return 1;
-}
-
 static inline u32 new_encode_dev(dev_t dev)
 {
 	unsigned major = MAJOR(dev);